A dyno (short for "dynamic move") is a jump on a climbing wall — the climber explodes upward or sideways, leaves all four limbs off their starting holds, and grabs a target hold mid-flight. Done well, the climber arrives at the new hold at the "deadpoint" — the instant of zero vertical velocity at the top of the jump — and locks on smoothly.
Dynos appear when holds are too far apart to reach statically. They demand explosive leg drive, full-body coordination, and the courage to commit. Common types include the up-and-out dyno (jumping forward off a wall), the sideways dyno (lateral leap to a sloper), and the double dyno (both hands launch and grab simultaneously).
Training dynos is mostly about practice and progression: start with small reaches, train hip drive on a flat ground hop, and rehearse the same dyno many times on a known wall. The fall is usually safe in modern bouldering gyms — pads catch you cleanly. Outdoors, spotters and crash pads are critical.